Diigo

When I first started using Diigo, I had a tiny bit of trouble but once I add it to my Google Chrome the little symbol showed up and it was easy. I see a site that I like, I click the symbol, bookmark it and add tags. I do like the tag part. It keeps all of my sources organized which is very important when teaching several science classes. I am now using it more than bookmarks. So I ask, is there an app for diigo also so I can add to my list from my iPad?